Kingfish Hall at Quincy Marketplace. Tourist area but the food is excellent. For a real and fancy Boston experience go to Locke-Ober. Very old Boston restaurant taken over a few years ago by Lydia Shire. Used to be a favorite of JFK's. Lobster stew, lobster savannah, elegant old Boston atmosphere. Do search on this board for discussion.

I would agree with Neptune, but you can easily match the quality and substance of the experience in NYC. I'd go with Sel de la Terre in the Mandarin Hotel on Boylston. They're mighty consistent - at least in the Boston spots - and do a great lunch.